Being aware of the distribution of Tricula snails in the basin of Lanchang River (the upper reaches of Mekong River) in Yunnan Province of China, investigations were carried out since 1981.
由于以往已了解到湄公河上游中国云南境内澜沧江流域有拟钉螺分布，故自1981年开始进行调查。
The incident prompted the four countries through which the upper Mekong flows to agree to police the river jointly.
这次事件促使Mekong 河上游流过的4个国家同意共同维护河流域的治安。
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